Fingerprint Identification Method and Apparatus, Storage Medium and Terminal

ABSTRACT

A fingerprint identification method and apparatus, a storage medium and a terminal are provided. The fingerprint identification apparatus includes a glass cover plate, a touch sensing unit, a display unit, an optical film, an imaging unit, a photoelectric sensing unit, and a control unit. The optical film is provided with multiple light-transmitting regions and multiple light-blocking regions, the multiple light-blocking regions are used for blocking light emitted from at least a part of pixels that directly enters the optical film without being reflected by the glass cover plate or the to-be-identified fingerprint. With the fingerprint identification apparatus, a sharp image of a to-be-identified fingerprint (whether or not the to-be-identified fingerprint is from a dry finger) is collected, and a signal-to-noise ratio and an accuracy of fingerprint identification can be significantly improved.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims the priority to Chinese Patent ApplicationNo. 201811532017.6, titled “FINGERPRINT IDENTIFICATION METHOD ANDAPPARATUS, STORAGE MEDIUM AND TERMINAL”, filed on Dec. 14, 2018, whichis incorporated herein by reference in its entity.

TECHNICAL FIELD

The present disclosure relates to a fingerprint identification methodand apparatus, a storage medium and a terminal.

BACKGROUND

With the rapid development of science and technologies, the fingerprintidentification technology has been widely used in many electronicdevices, such as smart phones, banking systems and attendance systems.

Since the conventional capacitive fingerprint identification technologycan no longer meet a demand for an increased screen proportion ofdevices, and the ultrasonic fingerprint identification technology hasdeficiencies in terms of technology maturity and cost, the opticalfingerprint identification technology is expected to be a mainstreamtechnical solution for under-screen fingerprint identification.

In the conventional optical fingerprint imaging solution, an image of ato-be-identified fingerprint is collected mainly based on the totalreflection imaging principle of physical optics. With the conventionaloptical fingerprint imaging solution, although a sharp image can beobtained to a certain extent, a sharp and complete fingerprint image ofa “dry finger” cannot be obtained.

SUMMARY

An embodiment of the present disclosure provides a fingerprintidentification apparatus, which may collect a sharp image of ato-be-identified fingerprint (whether or not the to-be-identifiedfingerprint is from a dry finger), thereby significantly improving asignal-to-noise ratio and an accuracy of fingerprint identification.

The fingerprint identification apparatus according to the presentdisclosure includes a glass cover plate, a touch sensing unit, a displayunit, an optical film, an imaging unit, a photoelectric sensing unit,and a control unit. The glass cover plate has a touch interface forcontacting with a to-be-identified fingerprint. The touch sensing unitis configured to detect a touch signal of the to-be-identifiedfingerprint. The display unit is provided with pixels in one or morediscrete point light source regions. The control unit is configured tosend a display driving signal to the display unit when the touch sensingunit detects the touch signal, to drive at least a part of the pixels inthe display unit to be lightened. The optical film is provided withmultiple light-transmitting regions and multiple light-blocking regions,and the multiple light-blocking regions are used for blocking lightemitted from the at least a part of pixels that directly enters theoptical film without being reflected by the glass cover plate or theto-be-identified fingerprint. The imaging unit includes a lens grouphaving at least one lens, and is configured to image theto-be-identified fingerprint onto the photoelectric sensing unit, wherelight emitted by the pixels is irradiated to the to-be-identifiedfingerprint via the glass cover plate. The photoelectric sensing unit isconfigured to receive a light signal generated by the imaging unit, andconvert the light signal to an electric signal.

In an embodiment, the glass cover plate, the touch sensing unit, thedisplay unit, the optical film, the imaging unit, the photoelectricsensing unit, and the control unit are sequentially arranged from top tobottom.

In an embodiment, the optical film is located below the display unit,and the plurality of light-blocking regions and the plurality oflight-transmitting regions are arranged alternatively with one beingsurrounded by another.

In an embodiment, the imaging unit has an object focus located in aplane where the optical film is located.

In an embodiment, the multiple light-blocking regions being used forblocking light emitted from the at least a part of pixels comprises thatthe light-blocking regions are located right below the at least a partof pixels in the display unit which are lightened. In some embodiment,an area of each of the light-blocking regions is equal to or greaterthan that of each of the at least a part of pixels.

In an embodiment, the point light source regions are arranged in atopological structure and are spaced apart from each other by alightless pixel region, and each of the point light source regions andthe lightless pixel region both include one or more pixels.

In an embodiment, the topological structure includes a multi-pointarrangement, a linear arrangement, a parallel line arrangement, acircular arrangement, a circular ring arrangement, a dotted linearrangement, or a parallel dotted line arrangement.

In an embodiment, the multiple light-transmitting regions are locatedright below the lightless pixel region.

In an embodiment, the optical film has an area smaller than or equal tothat of the display unit.

In an embodiment, each of the multiple light-transmitting regions has awidth L₁ of 0.1 mm to 5 mm. In an embodiment, the width L₁ is 0.2 mm to0.5 mm. In an embodiment, the width L₁ is 0.2 mm.

In an embodiment, each of the multiple light-blocking regions has awidth L₂ of 0.1 mm to 5 mm. In an embodiment, L₂≤L₁.

According to another aspect, a fingerprint identification method isfurther provided according to the present disclosure, which includes:sending, by a control unit, a display driving signal to a display unitto drive at least a part of pixels in the display unit to be lightened,when a touch sensing unit detects a touch signal that a to-be-identifiedfingerprint touches a glass cover plate; imaging, by an imaging unit,the to-be-identified fingerprint to which light emitted by the at leasta part of pixels is irradiated via the glass cover plate, onto aphotoelectric sensing unit; receiving, by the photoelectric sensingunit, a light signal emitted by the imaging unit, analyzing the lightsignal and outputting an image of the to-be-identified fingerprint; andcomparing the outputted image of the to-be-identified fingerprint with astandard fingerprint image to determine whether the outputted image ofthe to-be-identified fingerprint is similar to the standard fingerprintimage.

In an embodiment, pixels of the display unit are arranged in one or morepoint light source regions, the point light source regions are arrangedin a topological structure and are spaced apart from each other by alightless pixel region, and each of the point light source regions andthe lightless pixel region both include one or more pixels.

In an embodiment, imaging, by an imaging unit, the to-be-identifiedfingerprint to which light emitted from the at least a part of pixels isirradiated via the glass cover plate, onto a photoelectric sensing unitincludes: imaging, by the imaging unit, the to-be-identified fingerprintonto the photoelectric sensing unit, where the light emitted from the atleast a part of pixels is irradiated to the to-be-identified fingerprintvia the glass cover plate, and then passes through multiplelight-transmitting regions of an optical film after being reflected bythe to-be-identified fingerprint or the glass cover plate.

In an embodiment, multiple light-transmitting regions are located rightbelow the lightless pixel region.

In an embodiment, the optical film is provided with multiplelight-transmitting regions and multiple light-blocking regions, wherethe multiple light-blocking regions are located right below the at leasta part of pixels in the display unit which are lightened, an area ofeach of the multiple light-blocking regions is equal to or greater thanthat of the at least a part of pixels, to block light emitted from theat least a part of pixels that directly enters the optical film withoutbeing reflected by the glass cover plate or the to-be-identifiedfingerprint. In an embodiment, the optical film is located below thedisplay unit, the multiple light-blocking regions and the multiplelight-transmitting regions are arranged alternatively with one beingsurrounded by another.

In an embodiment, the imaging unit has an object focus located in aplane where the optical film is located.

According to another aspect, an electronic device is further providedaccording to the present disclosure, which includes the fingerprintidentification apparatus described above.

According to another aspect, a computer-readable storage medium isfurther provided according to the present disclosure, which has storedthereon computer instructions, wherein the computer instructions areexecuted to perform steps of the fingerprint identification methoddescribed above.

According to another aspect, a terminal is further provided according tothe present disclosure, which includes a memory and a processor, whereinthe memory has stored thereon computer instructions executable on theprocessor, and the computer instructions are executed by the processorto perform steps of the fingerprint identification method describedabove.

Compared with the conventional art, the fingerprint identificationapparatus according to the present disclosure is provided with anoptical film, and the optical film is provided with multiplelight-transmitting regions and multiple light-blocking regions that arearranged in an alternatively bright and dark manner, thus a sharp imageof a to-be-identified fingerprint (whether or not the to-be-identifiedfingerprint is from a dry finger) can be collected, therebysignificantly increasing a signal-to-noise ratio (for example, thesignal-to-noise ratio can be increased by at least 10 times), thusgreatly improving an accuracy of fingerprint identification.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of thepresent disclosure, embodiments of the present disclosure will bebriefly described below with reference to the drawings. However, thedrawings are not intended to limit the embodiments of the presentdisclosure.

FIG. 1 is a schematic structural diagram of a fingerprint identificationapparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an optical film according toan embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an optical film according toanother embodiment of the present disclosure; and

FIG. 4 is a schematic flowchart of a fingerprint identification methodaccording to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

As described in the background part, the conventional fingerprintidentification apparatus has many deficiencies. Specifically, infingerprint identification for a dry finger, there is a problem that thecollected fingerprint image cannot be identified due to a lowdefinition.

A “dry finger” described herein refers to a finger with a shallow skingrain at a finger pulp, a finger with a high dryness, a finger withinsufficiently secreted sebum or the like, the collected fingerprintimage of which has a light and thin fingerprint grain with a lowdefinition. For example, compared with a finger with normally secretedsebum, the finger with insufficiently secreted sebum has a hardfingerprint grain, such that a contact area of the fingerprint grain(such as a convex grain) with a fingerprint collection screen of afingerprint collector does not change with a change of a pressing forceof the finger in a case that the finger presses the fingerprintcollector, which results in a thin and light line in the finallycollected fingerprint image, thereby resulting in an overall un-sharpimage.

It has been found by research and analysis that, the conventionalfingerprint identification apparatus has a low signal-to-noise ratio.Specifically, with the conventional imaging structure with uniformillumination, light emitted from pixels in a display unit may affect theimaging of light reflected by a glass cover plate after being irradiatedupward and light scattered by a to-be-identified fingerprint and passesthrough a lens. Further, it has been found by deep research and analysisthat, in the conventional fingerprint identification apparatus, only nomore than 4% of the light irradiated toward the to-be-identifiedfingerprint can be reflected, in which a small portion can passesthrough the lens and is successfully imaged onto a sensing unit.Therefore, it is difficult for light scattered by the to-be-identifiedfingerprint after passing through the glass cover plate to form aneffective fingerprint image due to factors such as a dry finger. Sincethe conventional fingerprint identification apparatus can only image ato-be-identified fingerprint (for example, a finger) that is in goodcontact with the fingerprint identification apparatus or a portion of ato-be-identified fingerprint that is in full contact with the glasscover plate of the fingerprint identification apparatus by pressing, afingerprint image of the dry finger collected by the conventionalfingerprint identification apparatus has a low definition due to a smallcontact area of the dry finger with the glass cover plate.

Based on this, a fingerprint identification apparatus is providedaccording to the present disclosure. The fingerprint identificationapparatus is provided with an optical film, which is printed withmultiple light-transmitting regions and multiple light-blocking regionsthat are arranged in an alternatively bright and dark manner, such thata sharp image of a to-be-identified fingerprint (whether or not theto-be-identified fingerprint is from a dry finger) can be collected,thereby significantly increasing a signal-to-noise ratio by at least 10times, thus greatly improving an accuracy of fingerprint identification.

Technical contents, features, objectives, and effects of the technicalsolutions of the present disclosure are described in detail below inconjunction with specific embodiments and drawings.

Reference is made to FIG. 1, which is a schematic structural diagram ofa fingerprint identification apparatus according to an embodiment of thepresent disclosure. The fingerprint identification apparatus includes aglass cover plate 10, a touch sensing unit 20, a display unit 30, anoptical film 40, an imaging unit 50, a photoelectric sensing unit 60 anda control unit 70 that are sequentially arranged from top to bottom.

The glass cover plate 10 has a touch interface for contacting with ato-be-identified fingerprint F.

The touch sensing unit 20 is configured to detect a touch signal of theto-be-identified fingerprint F.

The display unit 30 is provided with pixels in one or more discretepoint light source regions. In a non-limiting embodiment of the presentdisclosure, the point light source regions are arranged in a topologicalstructure and are spaced apart from each other by a lightless pixel 302(not shown). Each of the point light source regions includes one or morepixels (such as a pixel 301 which is driven to be lightened and thelightless pixel 302). In a non-limiting embodiment of the presentdisclosure, the topological structure includes a single-pointarrangement, a multi-point arrangement, a linear arrangement, a parallelline arrangement, a circular arrangement, a circular ring arrangement, adotted line arrangement, or a parallel dotted line arrangement.

The optical film 40 is a transparent optical thin film, which is capableof transmitting light with a specific wavelength, for example, a greenlight with a wavelength of 520 nm to 550 nm, and filtering out otherlight that does not meet the condition. In order to effectively collectand identify an image of a to-be-identified fingerprint (especially ato-be-identified fingerprint of a dry finger), the optical film 40 isprovided with multiple light-transmitting regions 401 and multiplelight-blocking regions 402 arranged in an alternatively bright and darkmanner. The light-blocking regions 402 are used for blocking lightemitted from the pixel 301 in the display unit 30 downward. The multiplelight-blocking regions 402 and the multiple light-transmitting regions401 are arranged alternatively with one being surrounded by another.With this design, an effective fingerprint image can be obtained by thephotoelectric sensing unit 60 with light scattered from theto-be-identified fingerprint.

In a non-limiting embodiment of the present disclosure, thelight-blocking regions 402 are located right below at least a part ofpixels 301 in the display unit which are driven to be lightened, and anarea of each of the light-blocking regions 402 is equal to or greaterthan that of the at least a part of pixels 301. The light-blockingregions 402 may be an opaque black printed pattern. In a non-limitingembodiment of the present disclosure, the light-transmitting regions 401are located right below the lightless pixel 302 for light scattered fromthe to-be-identified fingerprint to pass through.

In a non-limiting embodiment of the present disclosure, the optical film40 may have a rectangular, square, or circular shape. Preferably, theoptical film 40 has a circular shape. In a non-limiting embodiment ofthe present disclosure, the optical film 40 has an area smaller than orequal to that of the display unit 30. Alternatively, the optical film 40has a diameter smaller than or equal to a length (and/or a width) of thedisplay unit 30.

The light-transmitting regions 401 and the light-blocking regions 402may be designed based on the shape of the optical film 40.

For example, reference is made to FIG. 2. In a non-limiting embodimentof the present disclosure, if the optical film 40 has a square (orrectangular) shape, the light-transmitting regions 401 and thelight-blocking regions 402 may be designed to have a smaller square (orrectangular) shape. The optical film 40 includes multiplelight-transmitting regions 401 and multiple light-blocking regions 402arranged in an alternatively bright and dark manner, and the multiplelight-blocking regions 402 and the multiple light-transmitting regions401 are arranged alternatively with one being surrounded by another. Ina non-limiting embodiment of the present disclosure, thelight-transmitting regions 401 has a width L₁ of 0.1 mm to 5 mm,preferably 0.2 mm to 0.5 mm, and more preferably 0.2mm. In anon-limiting embodiment of the present disclosure, the light-blockingregions 402 has a width L₂ of 0.1 mm to 5 mm. In some embodiment, L₂≤L₁.

As another example, reference is made to FIG. 3. In a non-limitingembodiment of the present disclosure, if an optical film 40′ has acircular shape, which is printed with multiple light-transmittingregions 401′ and multiple light-blocking regions 402′ (each of which hasa circular ring shape) arranged in an alternatively bright and darkmanner, and the multiple light-blocking regions 402′ and the multiplelight-transmitting regions 401′ are arranged alternatively with onebeing surrounded by another. In a non-limiting embodiment of the presentdisclosure, the light-transmitting regions 401′ have a radial width d₁of 0.1 mm to 5 mm, preferably 0.2 mm to 0.5 mm, and more preferably 0.2mm. In a non-limiting embodiment of the present disclosure, thelight-blocking regions 402′ have a radial width d₂ of 0.1 mm to 5 mm,and d₂≤d₁.

The imaging unit 50 includes a lens group, and the lens group includesat least one lens 501. The imaging unit 50 is configured to image theto-be-identified fingerprint F to which light emitted from the pixel 301is irradiated via the glass cover plate 10 onto the photoelectricsensing unit 60. It is required to locate the lens 501 at a positionsuch that the to-be-identified fingerprint F is imaged onto thephotoelectric sensing unit 60, where light emitted by the pixel 301 isirradiated to the to-be-identified fingerprint F via the glass coverplate 10, and then passes through the light-transmitting regions of theoptical film after being reflected (scattered) by the to-be-identifiedfingerprint F. For example, the lens 501 is set to have an object focussmaller than 1mm. In a non-limiting embodiment of the presentdisclosure, the imaging unit 50 has an object focus located in a planewhere the optical film 40 is located.

The photoelectric sensing unit 60 is configured to receive a lightsignal emitted by the imaging unit 50, and convert the light signal toan electric signal, the light signal is analyzed and an image of theto-be-identified fingerprint F is output.

The control unit 70 is configured to send a display driving signal tothe display unit 30 when the touch sensing unit 20 detects the touchsignal, to drive at least a part of pixels 301 in the display unit to belightened.

It should be appreciated by those skilled in the art that FIG. 1 is onlya simple schematic structural diagram shown for convenience ofexplaining positional relationship of various component units of thefingerprint identification apparatus of the present disclosure, ratherthan that of a real object. Therefore, the shape or size of eachcomponent shown in FIG. 1 is not intended to limit the technicalsolutions of the present disclosure.

Reference is made to FIG. 4, which is a schematic flowchart of afingerprint identification method according to an embodiment of thepresent disclosure. In a non-limiting embodiment of the presentdisclosure, the fingerprint identification method includes the followingsteps S101 to S105. In S101, a glass cover plate is touched with ato-be-identified fingerprint. In S102, a control unit sends a displaydriving signal to a display unit when a touch sensing unit detects atouch signal, to drive at least a part of pixels in the display unit tobe lightened. In S103, an imaging unit images the to-be-identifiedfingerprint to which light emitted by the pixels is irradiated via theglass cover plate, onto a photoelectric sensing unit. In S104, thephotoelectric sensing unit receives a light signal emitted by theimaging unit, and convert the light signal to an electric signal, thelight signal is analyzed and an image of the to-be-identifiedfingerprint F is output. In S105, the outputted image of theto-be-identified fingerprint is compared with a standard fingerprintimage to determine whether the outputted image of the to-be-identifiedfingerprint is similar to the standard fingerprint image. If theoutputted image of the to-be-identified fingerprint is similar to thestandard fingerprint image, it is determined that the identification issuccessful; and if the outputted image of the to-be-identifiedfingerprint is not similar to the standard fingerprint image, theprocess ends or it is determined that the identification is failed.

In a non-limiting embodiment of the present disclosure, the imaging unitimages the to-be-identified fingerprint onto the photoelectric sensingunit, where the light emitted from the pixels is irradiated to theto-be-identified fingerprint via the glass cover plate, and then passesthrough the multiple light-transmitting regions of the optical filmafter being reflected by the to-be-identified fingerprint.

In a non-limiting embodiment of the present disclosure, an electronicdevice is provided, which includes the fingerprint identificationapparatus described above. For the specific structure of the fingerprintidentification apparatus, reference is made to the above description,which is not repeated here.

In a non-limiting embodiment of the present disclosure, acomputer-readable storage medium is provided, which has stored thereoncomputer instructions. The computer instructions, when being executed,perform steps of the method described above, which is not repeated here.

In a non-limiting embodiment of the present disclosure, a terminal isprovided, which includes a memory and a processor, where the memory hasstored thereon computer instructions. The computer instructions, whenbeing executed by the processor, perform the steps of the methoddescribed above, which is not repeated here.

In a non-limiting embodiment of the present disclosure, the terminalincludes, but is not limited to, a personal computer, a server, ageneral purpose computer, a special purpose computer, a network device,an embedded device, a programmable device, a smart mobile terminal (suchas a mobile phone, an IPAD, a POS machine), a smart home device (such asa smart fingerprint lock), a wearable smart device, an on-board smartdevice, a fingerprint identification apparatus (such as a fingerprintcard punch or an attendance machine).

It should be noted that although the above embodiments are describedherein, the protection scope of the present disclosure is not limitedthereto. Therefore, based on the innovative concepts of the presentdisclosure, changes and modifications to the described embodimentsherein, transformations of the equivalent structures or equivalentprocesses made based on the description and the drawings of the presentdisclosure, and direct or indirect application the above technicalsolutions in other related technical fields should all included in theprotection scope of the present disclosure.

1. A fingerprint identification apparatus, comprising: a glass coverplate, a touch sensing unit, a display unit, an optical film, an imagingunit, a photoelectric sensing unit, and a control unit, wherein theglass cover plate has a touch interface for contacting with ato-be-identified fingerprint; the touch sensing unit is configured todetect a touch signal of the to-be-identified fingerprint; the displayunit is provided with pixels in one or more point light source regions;the control unit is configured to send a display driving signal to thedisplay unit when the touch sensing unit detects the touch signal, todrive at least a part of the pixels in the display unit to be lightened;the optical film is provided with a plurality of light-transmittingregions and a plurality of light-blocking regions, and the plurality oflight-blocking regions are used for blocking light emitted from the atleast a part of pixels that directly enters the optical film withoutbeing reflected by the glass cover plate or the to-be-identifiedfingerprint; the imaging unit comprises a lens group having at least onelens, and is configured to image the to-be-identified fingerprint ontothe photoelectric sensing unit, wherein light emitted by the pixels isirradiated to the to-be-identified fingerprint via the glass coverplate; and the photoelectric sensing unit is configured to receive alight signal generated by the imaging unit and convert the light signalto an electric signal.
 2. The fingerprint identification apparatusaccording to claim 1, wherein the optical film is located below thedisplay unit, and the plurality of light-blocking regions and theplurality of light-transmitting regions are arranged alternatively withone being surrounded by another.
 3. The fingerprint identificationapparatus according to claim 1, wherein the imaging unit has an objectfocus located in a plane where the optical film is located.
 4. Thefingerprint identification apparatus according to claim 1, wherein theplurality of light-blocking regions being used for blocking lightemitted from the at least a part of pixels comprises that the pluralityof light blocking regions are located right below the at least a part ofpixels in the display unit which are lightened, and an area of each ofthe plurality of light-blocking regions is equal to or greater than thatof each of the at least a part of pixels.
 5. The fingerprintidentification apparatus according to claim 1, wherein the point lightsource regions are arranged in a topological structure and are spacedapart from each other by a lightless pixel region, and each of the pointlight source regions and the lightless pixel region both comprise one ormore pixels.
 6. The fingerprint identification apparatus according toclaim 5, wherein the topological structure comprises a multi-pointarrangement, a linear arrangement, a parallel line arrangement, acircular arrangement, a circular ring arrangement, a dotted linearrangement, or a parallel dotted line arrangement.
 7. The fingerprintidentification apparatus according to claim 5, wherein the plurality oflight-transmitting regions are located right below the lightless pixelregion.
 8. The fingerprint identification apparatus according to claim1, wherein the optical film has an area smaller than or equal to that ofthe display unit.
 9. The fingerprint identification apparatus accordingto claim 1, wherein each of the plurality of light-transmitting regionshas a width L₁ of 0.1mm to 5mm.
 10. The fingerprint identificationapparatus according to claim 1, wherein each of the plurality oflight-blocking regions has a width L2 of 0.1mm to 5mm.
 11. A fingerprintidentification method, comprising: sending, by a control unit, a displaydriving signal to a display unit to drive at least a part of pixels inthe display unit to be lightened, when a touch sensing unit detects atouch signal that a to-be-identified fingerprint touches a glass coverplate; imaging, by an imaging unit, the to-be-identified fingerprint towhich light emitted from the at least a part of pixels is irradiated viathe glass cover plate, onto a photoelectric sensing unit; receiving, bythe photoelectric sensing unit, a light signal emitted by the imagingunit, analyzing the light signal and outputting an image of theto-be-identified; and comparing the outputted image of theto-be-identified fingerprint with a standard fingerprint image todetermine whether the outputted image of the to-be-identifiedfingerprint is similar to the standard fingerprint image.
 12. Thefingerprint identification method according to claim 11, wherein thepixels of the display unit are arranged in one or more point lightsource regions, the point light source regions are arranged in atopological structure and are spaced apart from each other by alightless pixel region, and each of the point light source regions andthe lightless pixel region both comprise one or more pixels.
 13. Thefingerprint identification method according to claim 12, whereinimaging, by an imaging unit, the to-be-identified fingerprint to whichlight emitted from the at least a part of pixels is irradiated via theglass cover plate, onto a photoelectric sensing unit comprises: imaging,by the imaging unit, the to-be-identified fingerprint onto thephotoelectric sensing unit, wherein the light emitted from the at leasta part of pixels is irradiated to the to-be-identified fingerprint viathe glass cover plate, and then passes through a plurality oflight-transmitting regions of an optical film after being reflected bythe to-be-identified fingerprint or the glass cover plate.
 14. Thefingerprint identification method according to claim 13, wherein theplurality of light-transmitting regions are located right below thelightless pixel region.
 15. The fingerprint identification methodaccording to claim 13, wherein the optical film is further provided witha plurality of light-blocking regions, wherein the plurality oflight-blocking regions are located right below the at least a part ofpixels in the display unit which are lightened, an area of each of theplurality of light-blocking regions is equal to or greater than that ofeach of the at least a part of pixels, to block light emitted from theat least a part of pixels that directly enters the optical film withoutbeing reflected by the glass cover plate or the to-be-identifiedfingerprint.
 16. The fingerprint identification method according toclaim 15, the optical film is located below the display unit, and theplurality of light-blocking regions and the plurality oflight-transmitting regions are arranged alternatively with one beingsurrounded by another.
 17. The fingerprint identification methodaccording to claim 15, wherein the imaging unit has an object focuslocated in a plane where the optical film is located.
 18. Acomputer-readable storage medium having stored thereon computerinstructions, wherein the computer instructions are executed to performsteps of the fingerprint identification method according to claim 11.